Id on W/E this tentacle thing is??

[rubertoe93]

Good morning reefers! Over the past few days I’ve noticed these strange sweeper like tentacles coming from my live rock, the rock was dry when I first set up,
What are they? And if I need to how to I get rid of them?

 

[gonzo620]

Digitate Hydroid. Harmless and tend to disappear on their own.

 

[rubertoe93]

Brilliant! Thank you